scholarly journals Welding Window: Comparison of Deribas’ and Wittman’s Approaches and SPH Simulation Results

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1323 ◽  
Author(s):  
Yulia Yu. Émurlaeva ◽  
Ivan A. Bataev ◽  
Qiang Zhou ◽  
Daria V. Lazurenko ◽  
Ivan V. Ivanov ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
High Velocity ◽  
High Velocity Impact ◽  
Sph Method ◽  
Velocity Impact ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Impact Welding ◽  
Simulation Results ◽  
Sph Simulation

A welding window is one of the key concepts used to select optimal regimes for high-velocity impact welding. In a number of recent studies, the method of smoothed particle hydrodynamics (SPH) was used to find the welding window. In this paper, an attempt is made to compare the results of SPH simulation and classical approaches to find the boundaries of a welding window. The experimental data on the welding of 6061-T6 alloy obtained by Wittman were used to verify the simulation results. Numerical simulation of high-velocity impact accompanied by deformation and heating was carried out by the SPH method in Ansys Autodyn software. To analyze the cooling process, the heat equation was solved using the finite difference method. Numerical simulation reproduced most of the explosion welding phenomena, in particular, the formation of waves, vortices, and jets. The left, right, and lower boundaries found using numerical simulations were in good agreement with those found using Wittman’s and Deribas’s approaches. At the same time, significant differences were found in the position of the upper limit. The results of this study improve understanding of the mechanism of joint formation during high-velocity impact welding.

Joining of thin plates by high velocity impact welding: Experimental study and SPH simulation

2018 ◽  
Author(s):  
Yu. Yu. Emurlaeva ◽  
I. A. Bataev ◽  
S. Tanaka ◽  
I. V. Ivanov ◽  
E. I. Tkachenko
Keyword(s):  
Experimental Study ◽  
High Velocity ◽  
Thin Plates ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Impact Welding ◽  
Sph Simulation

Numerical Study on High Velocity Impact Welding Using a Modified SPH Method

2018 ◽  
Vol 16 (02) ◽  
pp. 1846001 ◽  
Author(s):  
Z. L. Zhang ◽  
T. Ma ◽  
M. B. Liu ◽  
D. Feng
Keyword(s):  
High Velocity ◽  
Numerical Study ◽  
Welding Process ◽  
High Velocity Impact ◽  
Sph Method ◽  
Velocity Impact ◽  
Kernel Gradient Correction ◽  
Impact Welding ◽  
Wavy Interface ◽  
The Impact

High velocity impact welding (HVIW) involves processes like the impact of metal structures and strong fluid-structure interactions with complex phenomena such as interfacial waves and jet generation. It is very difficult to model the HVIW process with typical physics well captured due to the large deformation and moving interfaces, while the associated mechanisms inherent in HVIW are also not well understood. In this paper, the HVIW process is simulated using a modified smoothed particle hydrodynamics (SPH) model, in which the kernel gradient correction is used to improve computational accuracy and an artificial stress term is used to ease stress instability during the welding process. The mechanisms in HVIW are investigated, and typical phenomena including the wavy interface, jet formation, interfacial temperature and pressure distribution are captured. It is demonstrated that with proper impact welding velocity and initial welding angle, the modified SPH method can well reproduce the morphology evolution of the welding interface from straight to wavy and further to wavy interface with vortex shedding. Based on comprehensive numerical data from SPH simulations, the weldability windows for the HVIW are obtained and are compared with experimental and theoretical results. Welding limits for HVIW are also discussed in detail.

scholarly journals Application of Smoothed Particle Hydrodynamics (SPH) for the Simulation of Flow-like Landslides on 3D Terrains

2022 ◽  
Author(s):  
Binghui Cui ◽  
Liaojun Zhang
Keyword(s):  
Risk Assessment ◽  
Smoothed Particle Hydrodynamics ◽  
Disaster Mitigation ◽  
Sph Method ◽  
Landslide Event ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Simulation Results ◽  
Mitigation Design ◽  
The Impact

Abstract Flow-type landslide is one type of landslide that generally exhibits characteristics of high flow velocities, long jump distances, and poor predictability. Simulation of it facilitates propagation analysis and provides solutions for risk assessment and mitigation design. The smoothed particle hydrodynamics (SPH) method has been successfully applied to the simulation of two-dimensional (2D) and three-dimensional (3D) flow-like landslides. However, the influence of boundary resistance on the whole process of landslide failure is rarely discussed. In this study, a boundary algorithm considering the friction is proposed, and integrated into the boundary condition of the SPH method, and its accuracy is verified. Moreover, the Navier-Stokes equation combined with the non-Newtonian fluid rheology model was utilized to solve the dynamic behavior of the flow-like landslide. To verify its performance, the Shuicheng landslide event, which occurred in Guizhou, China, was taken as a case study. In the 2D simulation, a sensitivity analysis was conducted, and the results showed that the shearing strength parameters have more influence on the computation accuracy in comparison with the coefficient of viscosity. Afterwards, the dynamic characteristics of the landslide, such as the velocity and the impact area, were analyzed in the 3D simulation. The simulation results are in good agreement with the field investigations. The simulation results demonstrate that the SPH method performs well in reproducing the landslide process, and facilitates the analysis of landslide characteristics as well as the affected areas, which provides a scientific basis for conducting the risk assessment and disaster mitigation design.

Sign in / Sign up

Export Citation Format

Share Document